Malicious PDF — malware analysis report

Static analysis result for SHA-256 50db0bd4c8fb4fc5…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 01:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b353395c41154fb1a5d41574b6d505e SHA-1: 863280a6fadca6535b075eb64f2be5f31e6ec3b7 SHA-256: 50db0bd4c8fb4fc59d38028ac0e70d1a8296f5e96059e2f7b4b5288ccdf10638
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content, aligning with a phishing or credential harvesting attack pattern.

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 http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a102cabdbd---gomux.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/131342ccbe4fcdea66b573600c2bc85a/mobugofatej.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/708d78da1fc27d429b3faa602ed787f9/xevilokubapawiluwawanuri.pdf
    • https://grancom.by/upload/docs/31354432703.pdf
    • http://riggi.ru/userfiles/file/xenujaweboro.pdf
    • http://ristoranteibucanieri.it/userfiles/files/15615865497.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab37ee7a74a---jinefuleludurevi.pdf
    • http://andlupa.com/userfiles/file/wozoxololevexilu.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8bac60fd720c778a668afdec8a7a01f2/tikuj.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e4e3ba04bdd48a57ae4d8ec1d501102/dusibozotedazepizabari.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2be8fa81b60b45e365d24e6342dc55fb/kogosejudezalemokudokib.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ir4kh9qc2hgebfdu6k3feh4ljc/83815943556.pdf
    • http://beerskiboot.com/img/upload/file/86912347825.pdf
    • http://drapa-technika.cz/UserFiles/File/buvesa.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/zusekerizi.pdf
    • http://asianmosaicnyc.com/userfiles/file/kilujeb.pdf
    • http://asupuro.com/user_data/image//file/52392759398.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2e7fc2dda---kovas.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/a88199456b87d6fcfe8601b95b6a4de4/mewunivinopud.pdf
    • http://yokohama-model.com/userfiles/files/98159841575.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072103855b41---kolotosemegositagojil.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/sonexajekimomemefunuxuda.pdf
    • http://menafundinfo.com/userfiles/file/22720179312.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4c65494a36725c16b3fe6456050d31be/mupupatosi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=about+time+theme+piano
    • http://e1pl2.nazwa.pl/busy/fotki/file/liwigutodewipux.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_off0000ebb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 16792 bytes
font_01_sfnt_off000103c9.bin
df8a42a9d5cb5a0e9ff4dde254dde4d9f23f21f2214e5d4aa6b2c6ad9b0eb964
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 17340 bytes
font_02_sfnt_off00013102.bin
15aa9c5a80f59e63798c816fe2d863b9669270a3959261c71ee7e6cd571e0fed
pdf-font-stream PDF embedded font (sfnt) at offset 0x13102 10424 bytes