Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafc321a84903326…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 02:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a3fe4f978a7144682e9457812586be7 SHA-1: 738ee1bca7fa3b4e69fb94055e155ae3ead9fd30 SHA-256: aafc321a84903326826a281a7f0a05666b482c1f1f6b03f79f1f3a3b3944c178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aiswaryamatrimonials.com/fck_uploads/file/talitor.pdf In PDF document text
    • https://volnynaklad.cz/data/file/sodulenegozujekilejef.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/xaxabimivosuzofakur.pdfIn PDF document text
    • https://producto.works/userfiles/file/xogizumefetonaj.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2e1b5a1794ee096678b21f6d225959f1/jolej.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/72643062932.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/61531118748.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/wewujefitategubotidavufum.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/wabesolefufu.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/83896000040.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942790b09c5---93079634925.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/16163007885.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d47793466397f4e109669968f94b7538/92812658453.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4ab1b470e86ee12584587281b54921f1/fezobuxuviz.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/sovevibik.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/rgufbc9cdggdo8775tgpgqv9re/38558710081.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/68567975006.pdfIn PDF document text
    • http://abnicum.com/files/file/lopafex.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1c1c73912eeaff126a1f414c039db6fb/18680443976.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/kakal.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a247420abcbf55d991387a56a139e675/ziwulema.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/62918819671.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/60774647300.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/sijexixaradujavijon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=meiosis+worksheet+multiple+choice+answersPDF 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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 18628 bytes
SHA-256: 66c45b5612e9fcdd8648ae169bb6afa956089019441031678f8acf6d2a3a0e22
font_01_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 10908 bytes
SHA-256: 5f83e248d2ff7d4a553df4330d7fb4ab447fe7fd749a4fa9ade557206e16a878
font_02_sfnt_off00012259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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