Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1a868517be4622…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 00:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dda7af707ff4d7bc2819944c4d538a4f SHA-1: e1664ed4de5621e3e2c6a88051a60eb219f6ff23 SHA-256: bc1a868517be4622a4c64531a250013c82ff85c9ea0eae679d15bff9ce5f039b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of numerous external links on compromised infrastructure is a strong indicator of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc39caf15---rifoluxejikeki.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8c065aea6---zujetomag.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/luwudafifokabiwolovajez.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e581f64fcf---37224919768.pdfIn PDF document text
    • http://ruresept.ru/files/file/152193379.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/03be7c15cd2282627682fbbf767a381f/62937348120.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/51529594480.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd609228e32---bexagokalidoferonopuv.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/79315249320.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8k07bbheatoarvb7t7qhka20n/votid.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mq2tpuj2us3lpg7qhan00htpgg/karalifuzuf.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/57646304d16ed0bc513d720504849e94/83110141011.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a4c56b49---momigados.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c1e138a9d0f1a2f370c5a98dceb9b357/75914539993.pdfIn PDF document text
    • http://apsons.eu/files/file/sefulupajalex.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/lalarinupawewojefegexa.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qtf3b7jrt1ku29b1um5luc9hhs/zuzuxela.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/66567940847.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95510828156.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59b75ff54---38513775795.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/dupenotofizuxijixovikalo.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/eaa5f80083209a0ac15b19924c4bf7f6/80281185172.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4988ba3a9---63411325488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=super+sad+true+love+story+sparknotesPDF 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_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 18608 bytes
SHA-256: 95bcea5a4ba58ffdeb302c13bc001571a1968a5b164137c43d373853be4d4206
font_01_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 10740 bytes
SHA-256: 401bcc0e9f47609416fb98042402ffc1720c95d76f1b390c05a57c33a1eeb92d
font_02_sfnt_off0001359b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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