Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a6d56659bb90ec…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 12:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19f43d41ad231bde9dba98ee3e0d629f SHA-1: 2628f79141c4afe8c0c3a3f2a8459ea14153f44b SHA-256: 22a6d56659bb90ecfecb8a335a54673b2af8305618ee6a93a3d30ab39630da48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect victims to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/3ecdnbm7klta6bu20resqvkt9u/82031042454.pdf
    • http://0048.pl/48files/file/25490878257.pdf
    • http://melly-incendie.fr/img_db/rakunuzisonikoj.pdf
    • https://vinaconexmec.vn/uploads/news_file/xitifufukeliwema.pdf
    • http://an-ocn.ru/ckfinder/userfiles/files/28123226640.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/wogifejebokosuzab.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/18383756514.pdf
    • http://hyundai-dongdo.vn/images/files/93993217064.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/7b40542bd9a278106ac74155783cb53a/jofolabewewasibapiz.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/j9qi94e47ovd6vf2rjt4nq7mn8/10016212735.pdf
    • http://scandirent-new.ru/uploads/assets/file/41808611937.pdf
    • https://landatur.com/files/galeria/files/febori.pdf
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/42244546925.pdf
    • https://tgvl.in/uploads/fck/files/97815180016.pdf
    • http://provia-events.de/pics/fotos/1/file/67232375061.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/tisevinew.pdf
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/66171085501.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c48d401e06---widiroketisudebonibelidu.pdf
    • http://lyzebrno.cz/userfiles/file/vinik.pdf
    • https://tidurmalam2.com/contents/files/17972129486.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/17162048851.pdf
    • http://mextro.de/upload/files/68530471665.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=engineering+mechanics+dynamics+8th+edition+solution+manual+meriam+kraige+pdf
    • 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_off0000ae8f.bin
08b4df954701f60e0b7af2e4fcf6a31777326d7f0824db98942d67ed9e3b67e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 11564 bytes
font_01_sfnt_off0000c9a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A8 16792 bytes
font_02_sfnt_off0000e1ba.bin
55f51a596630cacf41cfde374aa327b46b8d7ad7b2bc8a9060039ffb50df0b41
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16076 bytes