Malicious PDF — malware analysis report

Static analysis result for SHA-256 780107fa5b37a096…

MALICIOUS

PDF

95.0 KB Created: 2021-07-25 13:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18fc2af42d19370c597d4a17285c6bfe SHA-1: 1f8cdf8fd42195ea3815ed146a072afa8021474c SHA-256: 780107fa5b37a096e176bd4a5ce26e519c4e15b6e53ecd2546883aa66cc045f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting it's designed to evade static analysis of its content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6e79407f---81229451680.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/52d2c9ab7087cc218ad0211475d010ef/45292540913.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6617954bd9128f2230b187969e7ec56e/vasixazafak.pdf
    • http://littlepearlspublishing.in/data/eimages/file/bitilisadezi.pdf
    • https://bluza-shop.ru/content/File/sexazaput.pdf
    • http://snypes.nl/img/customer//files/reruvupadakutajakukojabi.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853fbb4378b---jonedorurepigonodi.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbab87ff2c---51911994687.pdf
    • http://franciscakeryandcatering.com/clients/61981/File/67698343282.pdf
    • http://kibbkw.com/uploads/files/xidokurasixif.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c8d6a06e---kobasosoro.pdf
    • http://uptownchantilly.com/uploads/files/97495605859.pdf
    • http://fotografieindex.nl/images/uploads/55011573172.pdf
    • https://akita-inu.lv/www/files/files/guburu.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/51203853050.pdf
    • https://deltagroup.bg/uploads/file/kipixorapodiputosesemula.pdf
    • https://angelsstaff.com/uploads/file/95427090362.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd894bfeb---xukakesijar.pdf
    • http://mispuntossaga.com/campannas/file/45612464673.pdf
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/46325830576.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce15782464---lipebenapojanisuzofal.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/33962947949.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=analisis+morfologico+de+oraciones+simples
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e68e.bin
c80ef1578f5af7f2095598a3066390f43d17981644a4b5074dfef66376468e1a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE68E 17360 bytes
font_01_sfnt_off0001008b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 16792 bytes
font_02_sfnt_off0001189d.bin
5fc5629d54b29c2e58615b9d185b89883758365e332edcdb081edf9b1b1c937a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 18996 bytes
font_03_sfnt_off0001488d.bin
7df7fa2e82cc03cc78273e3ae6ee1528e6bad376c331a052362e43ffef5c6963
pdf-font-stream PDF embedded font (sfnt) at offset 0x1488D 2296 bytes
font_04_sfnt_off00015290.bin
1eb4255b68288561c0a87e45a74232f6800df237eb3f581137a2536d42134fce
pdf-font-stream PDF embedded font (sfnt) at offset 0x15290 10844 bytes