Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e2747067451377…

MALICIOUS

PDF

82.6 KB Created: 2021-07-04 01:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb53f45a0e767e7cecd568a5aded3f21 SHA-1: 7738b9678e042829a9fe38d832f0d5b7e579a4e4 SHA-256: 40e2747067451377c2efeeb2edc131f9b117b0be2c9c2be93dfe5082f08572bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to external websites, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ede32a38e13b960562ffaca4712f427f/69118368649.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f332df50757f69b716023178826af29e/xamuboketuxozubozofe.pdf
    • http://varanini.pl/userfiles/file/12554860857.pdf
    • http://kfnmsz.com/upfolder/e/files/20210618134727.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b799128dcc0---nidiledafakibebus.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085249fdf646---99543939949.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/69142a9891354d07778c0aab401e30fb/lenapejutep.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/n0q3tcaugp2j2err646s7uajt4/42158602883.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5baf4dd861bcf6f9a8e6457c66094111/49888668248.pdf
    • https://atraba-holding.com/userfiles/file/dorabaditukezosup.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e461c7e79458cba70466623818970dc2/tuwajemama.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ee945d054614334d9138dbdaef8482ff/13814265060.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160918b4a41d42---88113942046.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10a0c44504---vozomidepamapugigiva.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8s1uqemo85v2lss8l063co9b95/87936708852.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac746f4b73b---21391334417.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2404d34e44---22195003235.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdeb950569---bogegatimarebivizipo.pdf
    • http://coopmong.com/ckupload/files/fagurorim.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c233ecd912---54145352835.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/77773f4e3e4c0c79bb6d6af6a8952420/75595746094.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/59eber1q93s0ap4h3p9ugmiiaq7h79lg/26662088522.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3f896abb---woveduwesowibolodeki.pdf
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/82011439690.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/aee0eb900cb772ddbb7ab02531dcbdc1/saditutepuri.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nail+shop+on+63rd
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc95.bin
0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 16376 bytes
font_01_sfnt_off0000e2bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 16792 bytes
font_02_sfnt_off0000facf.bin
bf7f684aeed2ecdc063edc8f4771532a50b020e2cea2dab5ca6fb25a89ab7137		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 16340 bytes
font_03_sfnt_off0001252c.bin
430e8340d322c006893262d01009318ab70a88930e09577a82e0f0cf41250736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 10576 bytes

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