Malicious PDF — malware analysis report

Static analysis result for SHA-256 a152ceb438faa348…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 06:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d7a27f48f7653a27549e7d566071b73 SHA-1: b52a788dd54558390b5424611b0e04b1ebd15bd7 SHA-256: a152ceb438faa3482edd4b5bac7f969f66b565d46687f49ec674b14ec5b26655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://nomylo.ru/uplcv?utm_term=pika+show+apps PDF link annotation
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143267ad2bef---74632253008.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/fikikowoxumurikarag.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/febosikuxumezijutivi.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/xusatipodatukosewebaduf.pdfIn PDF document text
    • https://kultmotor.hu/images/files/54514518946.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/39951838304.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xesivekexuxilulefu.pdfIn PDF document text
    • https://airxps.com/userfiles/files/roxonininumevowutuxukoka.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/zizukasinemag.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/nojalulivig.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/bijomeragewavusekejop.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/31621587670.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133f10c31a94---50930996288.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/13448679795.pdfIn PDF document text
    • http://teakdeck.pl/files/file/76657750927.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/40807756371.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/98302567528.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/xevogasofafo.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/49429347892.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/53263552886.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/xujapoginuwevegizo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/in38pdkgnqvk96vtps5a6cieaf/97503214634.pdfIn PDF document text
    • http://lovesenergy.com/file/26175123481.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/51043374092.pdfIn PDF document text
    • http://vkts.se/userfiles/file/nonikapubutijal.pdfIn PDF document text
    • 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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 17572 bytes
SHA-256: 990f3b8beb2cae30b5c3ae812b2904936c9cc88f090836a7b9ed2eb8fb8eff0f
font_01_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 10048 bytes
SHA-256: 123a5642d67d98c62ffd1bfdf848f99caf7c151060e1b0e8a8626f7c4a786716

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