PDF malware analysis — malicious · f5655a53cd8b7753

MALICIOUS

PDF

87.2 KB Created: 2021-07-04 01:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 8363ccebe7b728bb53a005ed004c5ef0 SHA-1: 840dca9c32b4b5d03fe22ee0f02460152a270b3f SHA-256: f5655a53cd8b77535d736a63a1a8a8f9e0e0f791502344f454f474a853e610ff

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document containing a link farm pointing to other PDFs hosted on compromised websites, a common tactic for distributing malware or conducting phishing. The 'SE_CALLBACK_LURE' heuristic suggests the document may also attempt to trick users into calling a fraudulent support number. While no scripts were directly extracted, the PDF structure and URL patterns strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/qgfrpfq4car1h9qu56lkkbvn8i/momigutov.pdf In PDF document text
- http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/79859328494.pdfIn PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c19f77e3d47eafe2ecd2384333290bff/masofopegipegavos.pdfIn PDF document text
- https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/839c4419a23b9dc478ddb1f5e42106f6/3444766467.pdfIn PDF document text
- http://sklepjola.pl/userfiles/file/55861934785.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160793f6e7ca00---zipudedore.pdfIn PDF document text
- http://bogelaipigeon.com/upload/file/10898568912.pdfIn PDF document text
- http://chothuexeninhbinh.net/data/dulieu/files/11368252563.pdfIn PDF document text
- http://medicapoland.pl/uploaded/file/3946090694.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b837f567369---55345410790.pdfIn PDF document text
- https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/bsjjlv6efv75c7qcklhrf52kef/11318077604.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hgsltkepvp1fb54rq4t3kh2cv8/nogigole.pdfIn PDF document text
- http://tantusmarina.com/UserFiles/file/3766843654.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e56c0b93e---97231413175.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d235e43516a---79542442940.pdfIn PDF document text
- https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/6b72e8006d75d5196d1a814b3bae6167/94884087738.pdfIn PDF document text
- http://fine-cottage.ru/userfiles/files/bevunedisebenuf.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f87528c6b---piwabowawawis.pdfIn PDF document text
- https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v1o3oi414509tm8l3iavjob8v6/gifupojiworudaj.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/opkju7erqk8f28ngca8fpeba4e/95314489597.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4cc933c0d---78568424900.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/105a6230a81c106925698476bcb2c75d/97233161259.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/gddgoss9cggi66m7bas6k0897a/29588289682.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5cfb3da58df9ec4487d021d704ae36ff/duwuvavosivulozasoba.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098c87dbdb3c---17790824954.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3d57838d---47554241533.pdfIn PDF document text
- http://jeyadhurgatemple.com/userfiles/file/nuzuvunulijisakusune.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fantastic+beasts+and+where+to+find+them+full+movie+for+freePDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f09c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF09C	16992 bytes
SHA-256: `0a0d1f8ba90b4b7c0cf0c87987618e780c674efb899fafd827ea99856e0f6fba`
`font_01_sfnt_off00011cf4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CF4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001350b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1350B	11108 bytes
SHA-256: `8d609810704b7edc415a4645b7017e80f190b3bfa6f60068021e2f103274bc0d`

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