Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62994e9d74f2b36…

MALICIOUS

PDF

83.1 KB Created: 2021-10-05 18:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d685fd1fad4858fcc9352e6509a4b3a7 SHA-1: 8ea71b37625b9f42bd963c6f29dc3a1db23e1f04 SHA-256: b62994e9d74f2b36b26511ec547d9904981cf59cdf621c9fab3df50eece22287
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites, some hosted on disposable domains. The document body is heavily obfuscated and likely contains further malicious content or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://lmtechsolution.com/userfiles/94877864787.pdf In PDF document text
    • http://baihsad.com/userfiles/files/20210915_170941.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/famud.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9e2e04ac2cc003b9ffea16cb1703d2d7/93691924970.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/55704031319.pdfIn PDF document text
    • http://darec.sk/files/files/bizevezidaverafok.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/38689214400.pdfIn PDF document text
    • https://10fci.info/userfiles/file/xegusapimuxojeba.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/33894761055.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/numutufawi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/02ssh8tbmc49s47emeo7arnj03/lajesufa.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/roxidekeranidajotepu.pdfIn PDF document text
    • https://servicepapik.ro/files/xudemekukonoxujikedadar.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/pulirorizizebevawa.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u532m0cph9bpdn10roj5dn2stb/74014527765.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/tovorurefewat.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161499dd55c4f3---woverewexebaxixa.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/lekesikujazavikafonat.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/mapokolimolifusov.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/zivil.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/83862464926.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/45288024613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=angry+country+musicPDF 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_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 17620 bytes
SHA-256: 310a9b1862f0b20a61a0413b83b05afb96c627f5a7bed78f028582f4d14f5b06
font_01_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 10428 bytes
SHA-256: f47c099a40c6be4bd58a8c9ef095c64580f423cd4ecc7c911e6376efa7ed67b2
font_02_sfnt_off0001273a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1