Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc328f62f055a4ec…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 06:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3149fc26f7207f7587e26669955f9891 SHA-1: a112a971ae736ba366de86fefa3465c938b6bcf6 SHA-256: cc328f62f055a4ec3fc1aeca89cc46447e5acabfddbd5ce2c0cfcc44ecb1328b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to direct users to phishing or malware sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zonwering-belgie.eu/ckfinder/userfiles/files/46397155204.pdf In PDF document text
    • https://baoholaodong24.com/userfiles/file/bagobuz.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/67713430561.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16097e9acf27c8---giwodokuvogetikexug.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/bupiliverad.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/05eb65233a767b7171d6bfd703d35a73/menudexemogujoxinepu.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/kozidozokikexija.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b8ce58c73578aabf134cff3eb27da54f/3102964771.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/67846123965.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/97506856690.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/jamikefitilexigu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf1605fb56---51083949102.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc54b2f524---jopuselabix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bd551b4c6---48483310597.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/buzazarozuxafimowujifub.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7c7d877b36b4afb04bca688645436419/xuwosaxiviwuverokik.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/zonoweruf.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/bejazaxumugununegasowimop.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/vekiduvujosikapuradosu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c878c27b3289d6ff72109d290540ae4f/rapot.pdfIn PDF document text
    • https://ptogel2.com/contents//files/kazotebasalalokotivoted.pdfIn PDF document text
    • http://martonelektro.hu/files/file/fidugos.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050621470756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+best+university+for+biomedical+engineeringPDF 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_off0000c028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC028 16124 bytes
SHA-256: e37b50bad003479cf6388b86406304356e0b74ee3b3f97d5e6ae1f5429e537b2
font_01_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 11336 bytes
SHA-256: 8d5b97c16de271f3840c04bdf1f5b639945d7b72a95c5c844c38078e3a38876c