Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfd8e5def390a82…

MALICIOUS

PDF

83.8 KB Created: 2021-07-03 07:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3eb75878444fc0c482adeb85b40e7e80 SHA-1: 8a05f342717bbe4d8a1afefd7fda675ca20effba SHA-256: acfd8e5def390a82377d9960265afe712c6e0354fba7f6061f8a07698d4286c9
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. The document contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=class+8+science+force+and+pressure+question+and+answer
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/41418dc4b98528416ddd2ae79bd703ea/redegorufevekirari.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/73540726691.pdf
    • http://esistore.be/userfiles/file/78177033387.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/u3oiphshi7o8c2378k9pqcq2ju/mifulolimusiwetotatit.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349d45a608---pikanuvozumi.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/2476b547feb5e417cba3d12768e3251a/lolatolasapivelawovisad.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2744d1394---bimaludeb.pdf
    • https://ceccargiurgiu.ro/userfiles/file/geropuka.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bea972a711---sojipo.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/panemuseludowefuxofipodu.pdf
    • https://biorenta.lt/ckfinder/userfiles/files/wurudevanameb.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fa370360---91536637124.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/dc64eab06008cea4a119714a0a21fba8/paratejugaranadese.pdf
    • http://kursadowicz.pl/Upload/file/mijowononegebu.pdf
    • http://sns.hu/_user/file/zodaperokarogiwalabiruw.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///gevuxijutisidajibafi.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed4186f8f---bolam.pdf
    • https://bluetact.com/ckfinder/userfiles/files/3802718324.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4nnv7vtbo35i81c6ulbni6vj52/nogabasagemudolatikewotat.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7jespg6go6kqhp9ur4oanoj660/wejilew.pdf
    • https://delphin-bau.com/ckfinder/upload/files/tinijeva.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa36183f2---71502382212.pdf
    • https://isleo.com/i_photos/file/rolibumo.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_off0000e46f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 16792 bytes
font_01_sfnt_off0000fc86.bin
df8e1c0eba671adceee5968c258211fabe42360c52438a387ebc4e6a379b66cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 11184 bytes
font_02_sfnt_off000116a8.bin
ce526c011f23d230ec3e3cb5bda301d0569bf8a018d43ce8fec8320f8f5bb4cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 16668 bytes