Malicious PDF — malware analysis report

Static analysis result for SHA-256 013a283a94b7fd55…

MALICIOUS

PDF

74.0 KB Created: 2021-06-30 22:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc613db64d4b46cdb3335133938c4a03 SHA-1: c81c65adc93eff8cac8584354d766c7d07e18115 SHA-256: 013a283a94b7fd5543625987f4ffa53652fb43d2fa6a0de3255ab64b8f276874
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/t2huttsb2ccjl68g2osuk2g0ks/javipadumafajenefew.pdf
    • http://guides2alpes.fr/uploads/file/23418856190.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b451c0a4a3e---28712321810.pdf
    • http://yasairamenbar.com/uploads/files/40679442013.pdf
    • https://baxsporthorses.com/userfiles/file/lebowezejojuf.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e9b2fe4e2150314c5e8026a63a81afee/vitorixavifeze.pdf
    • http://lica-mpt.it/userfiles/files/72094391510.pdf
    • https://farmacieitaliane.com/documenti/file/jolujatefamadevujozuvudez.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fb546eaad---rimarek.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608acb560d6d9---zesikenesivemujo.pdf
    • http://henca.com/files/details/file/64468361347.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/tuvewarebizetawab.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb3d5c11b---naxalinarup.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160913ddd69aa3---67478543530.pdf
    • http://chnli.tw/CKEdit/upload/files/45665625394.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907452e06b0---lijiw.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb48994d0---nijolelojifesavowajiz.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d59d9b906e---bowapepamazomi.pdf
    • https://autotrans911.com/thread/admin/uploads/file/24891593431.pdf
    • http://xboxheerlen.nl/userfiles/file/butozimar.pdf
    • https://maggies-handmade.com/UserFiles/files/31573348495.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/585064c1aaf6d9e6c5cedb9360250ae8/xifomevuwokopizipivivop.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8fc06e5ff---pebapabapuzevefifokalir.pdf
    • http://samuiluxurytravel.com/Uploads/file/mifojureduxagetatifuvaxu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=meaning+of+came+across
    • 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_off0000c1c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 16792 bytes
font_01_sfnt_off0000d9dc.bin
1396bedc4da5980383470e7ad7eecc6b2da75bf0eb9bd7a9249578d61bf083d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10528 bytes
font_02_sfnt_off0000f1c6.bin
e98fb7d90438af1b535bfc42b3aad602542f0baaa572a514a79a71285063cffd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 16128 bytes