Malicious PDF — malware analysis report

Static analysis result for SHA-256 677a8bb92dccdc3a…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 06:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61b063a4cea3deaeceafc94cbea41a92 SHA-1: 68a918b8ba5f0a634a47d2f72d9e046c3ad673fe SHA-256: 677a8bb92dccdc3ada6c6b08af996b6855bb2e183b4596ecd781dd210894fcb1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae3dea16a---saporo.pdf
    • https://tortugafilms.ca/adminfiles/file/titejuradijotekipazam.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/17a58f8df991ca48cc706848907972b8/jafonitose.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2111a56a5ba13c66909b53f98446c51b/reroxopimoraso.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5006fcd8f9a6dc632e73f2bf8c2471c5/kawunobafenumokediveb.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e8f79a22c33e1d89945b7d581477b0fc/wapenisovuliwisakif.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5d233103---tegipomekutipab.pdf
    • http://hglobaltour.com/FileData/ckfinder/files/20210604_0F77C63E4E14865A.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gupejifugokulavirev.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e088894981305d9dcd230c7575de5fd8/puvagixodulanira.pdf
    • https://ascinfratech.com/clientprojects/trading/file/rojosefejogi.pdf
    • https://ekransamara.ru/files/98280563157.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607080cd58b15---63004682767.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16070a29b52293---4271269374.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f0ccd9d90610247a9381ef01e5345ba8/meforinadijusuf.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01e56f10c---vefosejozulodotupap.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/j7846j05ki1m3homvfg28kdv32/putagawuberinunava.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccd2e877d---ranumuruwusewebid.pdf
    • http://ottotech.center/userfiles/file/xitisutegerusitobofogo.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bdgonjtfkvc060vlth7opr6lu7/fekodinadijovonuro.pdf
    • http://kfbi.ru/content/file/fekeravilumalifuno.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/cf793d3b4820725c97cc6924b9d46b35/71457497847.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=my+heart+will+go+on+violin+chords
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 16792 bytes
font_01_sfnt_off0000f80c.bin
9f6424a773847a9654eac19685053c7d1d3e1aef317929f36b48794d5efc2f55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 10908 bytes
font_02_sfnt_off0001111f.bin
758a1e8f747634c5dfb51e36f16cabfa221b9fbff9b5825b4baf491b421aa097
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 19268 bytes