PDF malware analysis — malicious · 30fe070b56721102

MALICIOUS

PDF

89.5 KB Created: 2021-07-23 16:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 087a0a6d5e31a62ababa6b72d913750c SHA-1: 52449f3fa4e510e5ad174b6879fe34cc3b9e68fa SHA-256: 30fe070b56721102651a685604854fcf3dedcb7458a15911a4fb00506015a110

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads, likely intended to lure users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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.
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 http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/30a8d8d5be7990c03d272912a617a489/96009750949.pdf In PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4124552cc75a0aee83e9dc7ef7de67e9/xunexixadipevotub.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ed29c0cf42be088220ea4432b6c6799f/75559784537.pdfIn PDF document text
- https://investmentskillsgroup.com/images/userfiles/file/1455938908.pdfIn PDF document text
- https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/vvmjrpn9l4uvqam76otc0codv2/34329755093.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2756763a66---jifanof.pdfIn PDF document text
- http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/47903846262.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qjurqov6c6huvl4tiidg34ue52/51977704031.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d965065ae---83896830044.pdfIn PDF document text
- https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d687e52f444---48944613636.pdfIn PDF document text
- http://natproperty.com/userfiles/files/11098260508.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a3600c00---vizekoludizixamijare.pdfIn PDF document text
- https://sitpchemcieszyn.pl/_sitpchem/file/fizogo.pdfIn PDF document text
- http://lapawan15.com/shop/fck_file/file/katogipilo.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c897be3288c---33843805212.pdfIn PDF document text
- http://self119.net/upload/userfiles/2021/06/files/210618034334.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3ec7b5b672dcdd474b7d41a29ed2bfc7/posuxifutotafadow.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082438795bf7---5824526003.pdfIn PDF document text
- http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac8025015---79687255174.pdfIn PDF document text
- https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f1669679d49fc87f3e9cbb83fc481bf7/58585546173.pdfIn PDF document text
- http://jarosi.hu/files/file/53177178767.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/2788853111.pdfIn PDF document text
- https://airshow-bg.com/file/30108982629.pdfIn PDF document text
- http://limuzine.md/userfiles/file/sifomus.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+write+a+memo+financial+reportPDF 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_off0000f948.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF948	17408 bytes
SHA-256: `63b73e2d442f739ce6159e907195a4d0d74fca2aa26259839a8d64d994fd1355`
`font_01_sfnt_off000126bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013ed2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13ED2	10552 bytes
SHA-256: `5d62f11a462bb130b877fa33f6caa4ee4d2c77d17928ce688addbbaf7eaa9e68`

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