Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f86828c1c46e32b…

MALICIOUS

PDF

84.2 KB Created: 2021-07-13 20:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e98a20815bfa80827823a824242b8d79 SHA-1: 6411cd75ad114de36e58f510427e308e8a51a58d SHA-256: 6f86828c1c46e32b3c872c3cfbd56bcb5785b1e1844e71126be478385beb4ae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting it functions as a link farm to distribute further malicious content or phish for information. No scripts were extracted, but the presence of external links and the overall detection profile points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af896c59212---viporibiwosatadovemeza.pdf In PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ddeb1e123b967a26907b06bc1aa7697f/kimenezunavuri.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/95478283559.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a04da30fb4e9b251d0ea6f7635ab4351/94905800106.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/mobobagudagutixukari.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/069a99b74be1f744fd5ad225042852e7/nasiwafatodenifod.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/wuwaxapakaga.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/jebekawefokonatejakezu.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/2526877011.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb11603a3---zolepewiwodeka.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/sopibojajefojiwubokotumus.pdfIn PDF document text
    • https://123natura.com/stockages/files/tozudovuzi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d505df13a18---rijivexafowefijig.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/64769613032.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/24e3632749b6ee2a7fe43581637defa6/57208148082.pdfIn PDF document text
    • http://billsky.ee/files/file/20007137733.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/16174782384.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c07baac047c---85667992074.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/zililezupanodidamog.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0b4313df0917915a23a4597d08a70d2b/82133321113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=object+reference+not+set+to+an+instance+of+an+object+solutionPDF 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_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 17656 bytes
SHA-256: 19b5319caf7d425cd3700fcc304102978c0145984290e0231daad241765ce0c4
font_02_sfnt_off00012ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC1 10724 bytes
SHA-256: fd9716ccc46701751652cf06f6bb421c7a25cdad129ac9a4fb4d0ec042349705

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