PDF malware analysis — malicious · 13691f3b977256d3

MALICIOUS

PDF

75.1 KB Created: 2021-07-22 16:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 22d8e70fa5a1b85f96a6fd9d8a993215 SHA-1: 2400db55da3b5e4aea1c0ff905cb791436a7688b SHA-256: 13691f3b977256d3087f92c4d3b81c524e16636d2918f6eb2c5a3e8b033d4692

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document's structure and embedded URLs indicate a tactic of using compromised sites to host or redirect to malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

Heuristics 6

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.
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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/b4df5604ad5891e658902de9de2cd91f/23220916261.pdf In PDF document text
- https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f3791af1d871a5765f5534e4332573f7/xuxiluxigop.pdfIn PDF document text
- http://animalscipublisher.com/files/upfiles/file/85260712495.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/89451672056.pdfIn PDF document text
- https://iuoshili.com/upload/users/files/79190589772.pdfIn PDF document text
- https://12shio1.com/contents//files/81906392343.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5d3705736e7c4ad31450c319130a76ec/bupivomogukuxa.pdfIn PDF document text
- http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eac13ff2a---supikekoga.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/85qk9sht4852qn3muq203c1i8s/jesusonapagarunaso.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ca62edcf---23597365930.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080db862f4a0---domijiwazilusizeroku.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/86901810338.pdfIn PDF document text
- http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e06295f5d---lexukelivozul.pdfIn PDF document text
- https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/01gol36jd23356719b6jvou4l9/ruposabusuwesi.pdfIn PDF document text
- http://pamatudarbai.lt/ckfinder/userfiles/files/35603701238.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/50404181696.pdfIn PDF document text
- https://termofriz.rs//files/83319839692.pdfIn PDF document text
- http://www.stemcellhairclinic.com/files/files/wililifowawipiwudikis.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a33be50dc---76960230948.pdfIn PDF document text
- http://esipro.fr/userfiles/file/lonugexus.pdfIn PDF document text
- https://pypconsultores.mx/userfiles/file/72327239962.pdfIn PDF document text
- http://retroldn.com/userfiles/file/paxafepusalupewelap.pdfIn PDF document text
- http://schokobrunnen.com/idata/52729093858.pdfIn PDF document text
- http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac433c099a7---mafifepazazoruwafawu.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8d084adbe---tarakinalot.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9e69546a0983b9f2975720ba7b541968/negapaj.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160870cf3b9558---85548959967.pdfIn PDF document text
- https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/67i04imvqmjngspdv6e0ankcbj/30160017210.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=if+f+and+g+are+two+distinct+linear+functionsPDF 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_off0000c1d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1D8	16728 bytes
SHA-256: `d45d59779cc49d1117c016aa2961b9ec54ddc07949023b340065411bee957e75`
`font_01_sfnt_off0000ed76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED76	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001058d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1058D	10788 bytes
SHA-256: `e8bfadf707ac73968164c72922b637e54229d6e51369a84ac4c6f541daba1749`

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