Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a79baabbbbe55cf…

MALICIOUS

PDF

84.8 KB Created: 2021-06-25 22:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 53841b3bb76cd72b774147ca8facc9a1 SHA-1: 00ed9c9228f7258c1c0f733dddc3f698a2527488 SHA-256: 8a79baabbbbe55cf1b8d2b1bc61bdd5fc1796a472393a0b56da3f4516a4a0ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised CMS upload directories, likely serving as a lure to download further malware. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/115f42bebf3e3c9ac12de6467578c979/58109761418.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd382d0ec---suveb.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cccdabceb89---12022861895.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/vr67gln1tisclplrc1q6fisfkj/6980234996.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b18c5855---zubeviminitoxiguzuximub.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3351ebf41---42384317990.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16753860d---palogosoduxoxuva.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/69f96c0a964e407be4ed0bed9c18fd83/20995899826.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d90352eb18afe1b20d9f6d2568390d92/tetepewe.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/66d35901fe9229c3ef55f16436aa45c6/potuzi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767f72bc6f8---fomelasoxesiwalajot.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5e212b5a9b32d23182a9384a58c746ed/rejuviremepaj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16081c68f396be---24758180115.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/65576971269.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/964a0f8afa1d99d8bf80d5b868f212a2/zoragematutisarevetobo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7s8kdh0mevfnfgj8m2r535tvpn/nekovubituponumutiropij.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jusuruviwodikasifuparato.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/86ddb3rvk5jj2mnbvca0nmeamc/fikimamemojajevigaxozafu.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/terov.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/57367612042.pdfIn PDF document text
    • http://capital96.com/userfiles/file/vigetapapilejuxawexepufo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/da2511a52d70f03bbd91723d2015a1ef/20039494495.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/davulupuvatinedevikazewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=to+dive+past+tensePDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 10268 bytes
SHA-256: ee81902f6dc4760b40c4d5c0d8d0b84779e7abc8a3cdc9fd356da0c1152c0dc5
font_02_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 18600 bytes
SHA-256: e86021a6f18ab4c772e3423ce3447c23360a12dc9435bbdb2efc065658701ef6

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