Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1589a7dd664b6a…

MALICIOUS

PDF

90.6 KB Created: 2021-07-16 01:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f158fb007f136d0b2137f02fce5c176 SHA-1: f81fce11076099d300691a75a775567954d4a305 SHA-256: ad1589a7dd664b6a27bf0ebe3f27fc65f4d18c153448808c02b0da132358ce92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely intended to host or distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a60838e5---62400422481.pdf
    • https://hse.tw/upload/file/72026735165.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cabef987e740bed3c8c204b47a52de74/38539005346.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796298659f6---58672539961.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6368dcba90ad4b262e798464ec71a170/bopegaporisuxafebekulebab.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5645760db2---dapijoxusalefoxirozuki.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082611b60278---fewisokipoxonar.pdf
    • http://nextgenship.net/upload/file/20210615162376615532.pdf
    • https://mimpiindah168.com/contents//files/bakilemunojatog.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/br5e043vte5l9dr35a2ib53ml3/sukibiwedu.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4f2227a0a35649cb41d522b20eae3a9c/84687131253.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/760ovsv55vu3o128cg4vnsiev3/89532571467.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5cd18a66b---zavagarerelaragojabim.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/sdji6tq64pdu72fpaq6p6rbm32/90043814092.pdf
    • http://keyflounge.nl/userfiles/file/55680139269.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/kefedexi.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/brbn8bj3m48bvhfbkf2mtpdd8f/24098596418.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f8ba7390f---vobafifex.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608773bcb974a---mijiwasefemuvepiza.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/77052020006.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16096b2c94f1b3---toturezomadisa.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160accd3900f6b---redumadaka.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/20758bdd76ecce6489c2894ca3e326af/wewajok.pdf
    • http://aelma.com/sites/default/userfiles/file/59269590563.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=all+codes+in+shindo+life+2
    • 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_off0001001e.bin
a8fbf3afa7458c23db83b9a0a723ff72471c06a3c9ec450ed23a36541803954c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 10316 bytes
font_01_sfnt_off00011745.bin
dbf7dc165834bb7bb8484d03f0c23a0d6225c0df2a5b034d30be4a220ff4ea94
pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 17428 bytes
font_02_sfnt_off0001452e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1452E 16792 bytes