Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9faee2d083c9173…

MALICIOUS

PDF

90.0 KB Created: 2021-07-14 09:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df6e75dd682448353d1aa2a3c036d594 SHA-1: 8afc2af3a442ec8c9fd125c2a06b10fb88637515 SHA-256: a9faee2d083c9173d1a8e95dafc84d71b4e86bd1720635fc470beda1c3638afe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on potentially compromised CMS uploads, with numerous distinct hosts and disposable domains. While no scripts were extracted, the structure and URL patterns suggest it's designed to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nus9u8mmr69uk9m1orqbf9jne2/tematozovewakepipasut.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7b47b776a17e10ed9ac6b3fb6ae1f09e/60751116815.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8e1a011097ebddf06bb616b1d3805250/58678972999.pdf
    • https://aartipalette.com/userfiles/file/28665982923.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/17489031746.pdf
    • http://anthonyvienna.com/sites/default/files/file/63332574288.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a326dd3c44bf3aeac55f447c9a03adb3/4124679419.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7597d0816002d46ec0378b101d04c1c2/biwuwipigawosexanitunorog.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/da4448c2a4a56afa72a7b3d170f51d2d/43476916373.pdf
    • http://www.awakohchang.com/image/upload/File/alazowo.pdf
    • http://pantryscan.com/123cars/imagefck/file/daxozatasawuvoxumol.pdf
    • http://epoxidice.ro/mm/file/zawiw.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/cs7segr3mi9vpntogah4e7a8d2/simetitedugajaj.pdf
    • http://angarakshaksecurity.com/userfiles/file/kirini.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607480dccc6b2---jinixiz.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c3bada0a0e6e6ea6080086893ca56b13/genawatodowilukutema.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925bb7d22ff---meloxike.pdf
    • http://chixue.com/uploadfile/file/20210616021317.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/60s3r1ds1rbbsg6261s0feebh7/vewosatutuzadenuvaleguri.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b252458400---82924795040.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0e314f0ace32e6eeb446d1230f8a242a/99843476253.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb755bc55b8---85471358721.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab5fdea4d8---85119234028.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sampling+distribution+example+questions+answers
    • 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_off0000fc08.bin
b2a44bd623d173585551984f76354897f2462f4756a129c472395a080c3801bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 11384 bytes
font_01_sfnt_off00011622.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 16792 bytes
font_02_sfnt_off00012e34.bin
a3a6dcef6719412705194806858da3b7dc91dbbf2c2ead170d366ba0335592db
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 16960 bytes