Malicious PDF — malware analysis report

Static analysis result for SHA-256 0097c0d8ee9a83d9…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 03:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a71e413267328c8109097e189e17ff2 SHA-1: 1587657d6e2648d212fb300ec38251a08352653c SHA-256: 0097c0d8ee9a83d939fb756385cb9228b1a35d6d957c69a0b3e77cf84d2a9d6b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites hosted on disposable domains and potentially compromised CMS uploads. The embedded URLs suggest a phishing or malware distribution vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://targdenunti.ro/userfiles/file/jupofofifepiliwo.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb57d558c6---tovagotezodurobu.pdf
    • http://redigonda.it/userfiles/files/36615672887.pdf
    • http://kameleonhastanc.hu/files/file/desulunirizip.pdf
    • http://homeopathyhongkong.org/files/97905004379.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34968a31b0---87320289860.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4c3d5ae58de824cf035e5893063e3e85/sijojijox.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c03564da0---99567797025.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5ab41214---gazedudixigomugoxo.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c58b0d572---takafa.pdf
    • http://cropscipublisher.com/files/upfiles/file/8308424070.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ld1u3h7e3l04nu2e062v5hs9t7/borupazegadejesuvol.pdf
    • http://robwalker.net/fckupload/file/33580931360.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608366b2d8c94---45806863669.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/zasejojilekabivesuxot.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/56361542164.pdf
    • http://vincitydata.com/uploads/ckfinder/files/nebigemiribedadadupuk.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a499f14637a---92265230401.pdf
    • https://samavetpharm.com/userfiles/files/44318679633.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1dbd72987---96694389942.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d288779ab30---6661566636.pdf
    • http://barcelonasixtytwo.com/userfiles/file/78833864627.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6b7ad3a789202a0f4c50d74c9aa9c909/midizuwurujejozuzi.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f01cdd00f---gerawenuzalik.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/didh0h2s7vpb6bd9bpbb6a14mo/62614003137.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=air+force+special+investigations+officer
    • 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_off0000f0d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 16792 bytes
font_01_sfnt_off000108ef.bin
7fa38bd29f54b6eab99742733637dae7a99c206269c0f895a43576ba639205fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 10700 bytes
font_02_sfnt_off000121a9.bin
df010657f327c2183e3d3194a15fc74cd4fd7cd3872ae36637ce4ec117f768f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 16580 bytes