Malicious PDF — malware analysis report

Static analysis result for SHA-256 d808ad8885787be9…

MALICIOUS

PDF

90.9 KB Created: 2021-08-09 23:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 63ab65d2a15b3f29c0a7c9ca936a289c SHA-1: ac5ef9703e81301b9a2606cc8813100701bbd25d SHA-256: d808ad8885787be9e0569709d26847674703beceebb87b5032edec9d3abbb51a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. The presence of these link farms suggests the PDF is used to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://stalmost.pl/userfiles/file/risizafovubufejob.pdf In PDF document text
    • https://damiel.eu/userfiles/file/zodesojubisi.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/sawovidakix.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b76b31ecc85d058efdbdd2c3568eaa80/xawifomanuvaziwogabuxu.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/14587397081.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfcd69da8c---58772111109.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/lepovokegapivu.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/40497255147.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb85a293db7---78498974630.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdf1b55653---3197089956.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/69820791813.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2443fb1f5d---vudidepaba.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/5385379618.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abaaded88b1---75983333542.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/77670106346.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/tafafuze.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4de2653d8---woxisokowebes.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/xujezatima.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a9b9aae924298aa20fd86bc7ee29057c/judigajogu.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210728_0B6F70C132C136A1.pdfIn PDF document text
    • http://etre-belle.su/images/file/96335491368.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/jagezurezubojinunekosuxa.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/14720201773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=does+wendy%27s+have+benefitsPDF 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_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 10748 bytes
SHA-256: 50ee1651bdc34c1268fc1c11c97e61b3a887e5fb27c63c11bd737678f0d6f6e7
font_01_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 17464 bytes
SHA-256: 185c95a473c5b9f9a019659a8e1b7b0ae866ee6e91608883be4ca72866d7fe08

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