Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a42b45d185fb59…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 09:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7bcf26ed4ded1659a48d804d219fbb0 SHA-1: 0d1137e7d738fef8fd59b7e010fb915c0c53e882 SHA-256: 71a42b45d185fb599f638996c5a779eca6296a5150a92a93ce47fe3419f4a6d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=quartz+crystal+microbalance+pdf PDF link annotation
    • http://taiwan-casters.com/userfiles/file/telorofiru.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30a19a5d9---fijaxigixiv.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b5f6c340d15485b27c3516719f41feb8/51092040649.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fc9ca1120c40f291307b0db8f9ce5bb7/jorisovagigi.pdfIn PDF document text
    • http://handgun.ee/media/file/22076685525.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/mudomebajovututij.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/27d4b414110d1dd19bdef7387ecf8198/95329540495.pdfIn PDF document text
    • http://allycatering.com/userfiles/55100388329.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/84344642007.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/kizaxufogufafaremenagini.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/gezagexal.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/74269820533.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060706105931.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/godegonemopalono.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/jaborilusafesisoduz.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3bfd079ee---nimeniwo.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/4182624917.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/bivajizigewuwefujevu.pdfIn PDF document text
    • http://4yoga.by/pics/files/28320980367.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607393074895c---romagabigut.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/732e01b6e8dbdb58c56318a166fe8abd/gawesigaxalu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160982e071fdda---donowetul.pdfIn PDF document text
    • 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_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 11252 bytes
SHA-256: b4d7a5db19c2ce6ba0762c2bb06747bac55b4061a68d3e611c90117a160b133d
font_01_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 18348 bytes
SHA-256: 85d6bc6eab5b81220c681bf6ba703d0752cea741072cd0147bf782d971b96451

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