Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e151b0022be2c6b…

MALICIOUS

PDF

100.8 KB Created: 2021-09-04 23:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ac1cc6363f15a2b0b743f901f4ed935 SHA-1: 9c0cfa81b8d36b9abd412c21e94c5826d56c190f SHA-256: 2e151b0022be2c6bdb143f44758068f595f2816f1c11805180a02da0a02f5ab2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8595a7f1---19634627506.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161050e02ce50d---805162482.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210510/file/80990374034.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4985b3d4---kisapexexojilitaxigafit.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/riwiwulowifo.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/koruxojikufixafepimixufe.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/949u7ee8h6q2hekn1dt9cucggl/lususidirewudujobukapoxi.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/tusapunitosuwemobori.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/5483384781.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/56893241214.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/fosametavodovafoxo.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8190a0eaf43840ac7aae3694f0a2ed7c/jesulumojizukivigitumob.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/pozarewezofiv.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/3627542321.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/56648906765.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607976bbc1309---sanowavozugebeze.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/buzimatoxegagopekizumomi.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/jufadifitagijafirepa.pdfIn PDF document text
    • http://darec.sk/files/files/gigovibesenuge.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16107a32b199a3---finiribapen.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/828b208aea85fe1f406e8b065be0bf84/96431226247.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/kedole.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/12387113434.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/8801625317.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf63fc95a4---60894575431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=jpeg+to+word+small+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 10724 bytes
SHA-256: 0829c2167548b53bb822eaf4dd024f047d79998f14b4348ba0c2099eaa97f324
font_01_sfnt_off00013c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001548b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548B 18656 bytes
SHA-256: a1b7f1345cef6624ede316a893e868d9483dca42c802c5173f71a49aee573ea5