Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84c118a4261ca8b…

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 03:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f0676e1a6d3ccb3dd3004c2290bd63c SHA-1: 0bf932962690099bdba7f8a3c8561bec523230e4 SHA-256: a84c118a4261ca8b198b23291d5cefd533bf354c67b70ea4dce19c4d69cf1f7d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000557264d---vetofomekox.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000557264d---vetofomekox.pdf
    • http://bularz-auto.pl/images/userfiles/file/fadepipoxatuzaravoketi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5527fe07---90278669408.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3c02092e60e12870bdb9caa895bb2054/89172882869.pdf
    • http://eperon-kochersberg.com/img_db/21377249352.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/s626e9kb9dhb42lmjceepno2u5/92755504424.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffb7e73e7---ganosaxaze.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8dc7ac93189a98c497a840707fc2ef9f/muravixamokakajuxozal.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/mejexegodi.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/mesoguxevu.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/74332c4de869f08f6f0bcb2f040333ba/jofusoden.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bffc3f71ac77eb30a6f570ff1bed3181/wolodija.pdf
    • https://a2designbg.com/userfiles/file/43059825039.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b066f8a2480---11139180930.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1216c5b70---7748619631.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080627ded413---39254712983.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6pbco68gdv8ikvk6crreufqhs1/85073522082.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9a608a893ca82e0fc2094beeb4c1f1b8/juwazipejenekujaza.pdf
    • http://nietegeleuve.nl/cms/files/jononutamupezojovulawuf.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cac57fd15fc---65868172455.pdf
    • http://ambvetfanini.eu/userfiles/files/zeluxeporosu.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c593548d3af---52668305283.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/158a4a24e349315ed8b98b251d48e9c2/39708576835.pdf
    • https://groupburuemas2.com/contents//files/nekudokixotipaxatavuwi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wonder+woman+tamil+dubbed+movie+download
    • 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_off0000ef4a.bin
1af2860bbdecab29c1785097c6e03c2cb4e34c0766a914cf667d3e1ed0d62174		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 10624 bytes
font_01_sfnt_off0001078f.bin
91478d1b0b173b3b2c3cbd6a8ed7aa1ce325eb57456cd36ec6ed9ef76d2c7d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 16852 bytes
font_02_sfnt_off0001334e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1334E 16792 bytes

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