Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5af4d4548bd24d…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 20:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9210d31df5789b12f996f7703c531c20 SHA-1: b504a27081908c393671d63c0933840251d2fd4a SHA-256: 1d5af4d4548bd24d03fcd0b85a921a8ba4117c728c774dbb71ced9bf66b2f4d1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://duquenne-moteurs.fr/webroot/upload/files/85370791107.pdf
    • https://simorgh.it/uploads/file/19425686229.pdf
    • http://autosoftware.company/autoresponders_images/files/mosepimo.pdf
    • http://nessie-vinylcare.com/file/fiwejimeboxavabasujerar.pdf
    • https://tranthachcaodanang.com/uploads/image/files/2676645569.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8504da9c4---2283571793.pdf
    • http://strelnicebudejovice.cz/userfiles/file/26321915019.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e14921bfdec268d9f61985d741c286b0/39282115077.pdf
    • http://indagosrl.it/userfiles/files/monolimeronoba.pdf
    • http://www.greenfield-sustainability.com/images/files/11545908818.pdf
    • http://laskod.hu/userfiles/file/xitabufowadulaxezololafe.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/664dd23605be0d34620c9f4f03f8aaa9/xafomuzomawinufaduwi.pdf
    • https://triatlonshop.cz/userfiles/file/5783901907.pdf
    • http://trunghungplastic.com/luutru/files/mobekefarex.pdf
    • http://presssimayeshahr.ir/pic/file/vemurifepinuzubulezefi.pdf
    • https://cafemocion.com/userfiles/file/lavovozonafazubepegenigu.pdf
    • http://vonschickenfremont.com/uploads/files/tedokulilupenojose.pdf
    • http://halmar.info/userfiles/file/88299589018.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/10292052344.pdf
    • http://avvocatogiuliani.it/userfiles/files/62496369798.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=java+edition+free+for+android
    • 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_off0000eb97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16792 bytes
font_01_sfnt_off000103ae.bin
f4f583eee340764784363f0e3e6aefefda07b7377b7ae9ff77ae288c27b05b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 10188 bytes
font_02_sfnt_off00011a9a.bin
9de4db3630926c283c450b926d2ac52c3a2581dcf1e89be77cfb6180bfc4bde5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 19104 bytes

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