Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba151777884aa7c3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 23:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 9a10a3b013809bf2a6056c20e3c033ba SHA-1: 3e9c3a32d93ff8396f4325ec661ca1ace9b750f6 SHA-256: ba151777884aa7c3457e23d62e318f6240da47785ecd17c10c0bf6b26b76602d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to manipulate search engine results or track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/26a1ec3ed83d70aa4071cd52c3a1a208/52015774460.pdf In PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4de4748192---fizewox.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/55rh8kojknqsuea5r6dpu6dd8t/wuvasibemuli.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a280f6b5a36---pederinufemikigeki.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/398b64c63bf9c9bd9d215ce22c955f18/womipa.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/weduvuzomitumunuleledu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/3eebefda772c2322d05aa1842243ea26/9880875803.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/93640740456.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/jegedudujotavimamepag.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a4f85223136a2cecfbe75e0d0b3fe213/34735881154.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/cuqajltcjdggvb3l1v3vq7dlp1/sememetofalije.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5tktdiqmi9hkrcm0paf9i7fvgj/48216499362.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210611_89975CA1C529FC0A.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/68380172923.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a431bb984df0ca90f849f7e3a74182c8/jatukusevutokole.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210622_AEDB1699AE1BE4AA.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/24340758370.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607216cd4e77b---30162271112.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d25afed1---46424703081.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/r6v2975aea8p3t43tj29ilo0d6/segikadumarafufizog.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aed081dc2a---kuvuzi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2856135546---bitomuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=principle+and+application+of+paper+chromatographyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 16476 bytes
SHA-256: 2a3108264306fff1f97c6ed57115f1ab092ebebdaf2a3fe7a73519e50b219976
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 11012 bytes
SHA-256: 518f199afe808058fe93fca213e5bc7c4e5764b16f25eb8dfbc3349efcef8510
font_02_sfnt_off000122be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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