Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01e4ce272af193a…

MALICIOUS

PDF

107.8 KB Created: 2021-07-17 15:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f8394ab3bc428f673fbc91c3e00d52b SHA-1: 0ee03d83464156755c2232c1f22ed2149c64e8f9 SHA-256: a01e4ce272af193a17c13861465ff61d0f537ed8d2c97f24104a150a422f4f02
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 WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://textingrights.com/userfiles/files/sosakuxewavosegafaku.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc699a039---kulekejibofisu.pdf
    • http://cpspcb.com/uploads/files/36519843216.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4cf4c5814---51048958131.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607285d83daad---74650276644.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160811d0eb623b---90962249682.pdf
    • https://szekszardportal.hu/userfiles/file/99057462721.pdf
    • https://kaisar168.com/contents//files/21083339742.pdf
    • https://ost-fogging.com/upload/files/37690403032.pdf
    • https://shop-ecobati.com/medias/upload/files/95725549123.pdf
    • http://toyotarenta.net/FileData/ckfinder/files/20210707_2B4433EB25D47C82.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/os804k9qob1j7ldj1lgi8fonq9/niram.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/b0hmgaaurq37ofpoktco26erjb/juvajimamewijawokigu.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cd8180e71---vegusurudipedina.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160aee0c2e688a---91225929589.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/hmbm4mv00vhv62ves60g0edht1/tasematex.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/uph6ndeg1b1lf0bbuhn43a2as1/mubexilexubeliga.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a9ce0adc---72392486364.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1978d050652379e626e65f756029cce6/solalajilobuvejorikoder.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/nejubafujaxemusebudupiz.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca955f2eda---24153400909.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/cc6c9bdced1cc397da74bc1361061794/33857808038.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/67622372ba1923fc0c7fde189f7db342/bipotokasezaxir.pdf
    • https://fobh.net/userfiles/files/12221632921.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75d5c600f---8513653094.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dvd6c3ir20cm0fj9kv27l2fmat/36070854712.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=spruce+street+harbor+park+hours
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000123e6.bin
06774f7d7920263e6601454bf8b2663481f3826aeab13dfcc5b69a5db96820ea
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x123E6 17360 bytes
font_01_sfnt_off00013e2f.bin
f7969d9b73fe3052dd674f32c72bf2b28ffc40db3e9668fee335766c4b6f02f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2F 18556 bytes
font_02_sfnt_off00016f18.bin
8091360fe0ffc10fc4bc2a99464ae6925d43ec5399e06588d8b75d79de6f40b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F18 10636 bytes
font_03_sfnt_off0001875f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1875F 16792 bytes