Malicious PDF — malware analysis report

Static analysis result for SHA-256 0930696d128da4f0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 03:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65449db5ee8f32a59a148ad8a6084fc5 SHA-1: 123fcd071d411ecd35774b18ae1b95f23fa255bf SHA-256: 0930696d128da4f0678f28cf4a02e8ba99940bef45061de3b04fa18df24cd4a7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://garglob.ru/uplcv?utm_term=import+photos+from+android+to+windows+10
    • https://habibitours.net/ckfinder/userfiles/files/8949293379.pdf
    • http://storemisr.com/uploads/files/91981962486.pdf
    • http://meditopthailand.com/file/sepubumibubemomijede.pdf
    • https://sindhuinvestment.com/ckfinder/userfiles/files/7567892680.pdf
    • http://steelfurniturecn.com/d/files/zumapazexajesufugafetuj.pdf
    • http://shijijiaming.cn/filespath/files/20210914163552.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062d31f6f8---30888388277.pdf
    • http://pro-customer.de/userfiles/file/40668378101.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613485a744c74---jajugufakolebaj.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614089050c983---zuxetuvoluwesoto.pdf
    • http://mariancozma.com/_user/file/debemuwigarazajuxubila.pdf
    • https://mavachhaiphong.com/upload/files/tenewuwepazegiwumi.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f723569990---pexiwugivosejoxidoke.pdf
    • http://luatsugiadinhviet.com/upload/ck/files/2455228929.pdf
    • http://somkuthyoptika.hu/editor_up/jububobutegexug.pdf
    • https://npkfertilizerproduction.com/d/files/soxufuwul.pdf
    • https://cubic.is/userfiles/file/38155678005.pdf
    • http://okuninka-biale.pl/userfiles/file/24604309902.pdf
    • https://baxsporthorses.nl/userfiles/file/wewumutogudi.pdf
    • https://blogsma.com/files/gegopabeletu.pdf
    • http://splhardware.com/UploadFile/file/2021090504571573499.pdf
    • https://alarouba.com/ckfinder/userfiles/files/jarogiverumepibateruvo.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/895df1a750e7c05c6d07ebd06c64aaea/57597430784.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/15822741553.pdf
    • 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_off0000cc36.bin
195e401911f551a335682825246ee016e951d3d05d4c73bf303fd30be5253815
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 17380 bytes
font_01_sfnt_off0000f8e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 16792 bytes
font_02_sfnt_off000110fc.bin
fe814330ca60e608ed2111e864c2d302b8bbac68affd2fe141c13860edd6e371
pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 10796 bytes