Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5cda614b8307c0…

MALICIOUS

PDF

108.8 KB Created: 2021-07-29 20:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ab2818b5c03592e084635e068957b53 SHA-1: 7900ba3fe5ad14d3515d158af4047a5456be773f SHA-256: 7a5cda614b8307c070455eeb92321655842e22379f5a483d31adb76173ea7861
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://crewmak.ru/uplcv?utm_term=blood+is+thicker+than+water+quotes+friendship PDF link annotation
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a490e444c4db29225f15447b8de2a3f7/84675813544.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/87994663128.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/5a660050ff079c42c5975f1cf34f310c/22447682201.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/31320851987.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-13/20210513031612776264.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/21de9e8827d2abb3ee60a2869ea576b4/ripetibudow.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5e8739d923d2a28e7d01af59d74c45d5/janatewowukamuzojuli.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n3qf9eumig89198r269mdn3km2/41135964631.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2104f6244e---vawoguxivavas.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/64049797803.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6f6b18a4345919ae76e4547119192516/37155938738.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6034b13df---79588703934.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/62442521352.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8494d9e74---sedasusidu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/633e5d45ed82827ea8433b3d24158149/12420165660.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608289c6943e8---76283686031.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/vuveburumikulifunumek.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2c80d4de6d9b2b8b79fa4e98e1670612/logafebojaz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/l75iqia23ie9ihq7cje6jbrfcn/31746455850.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ec1e37739bde7e953f41f8a2500669df/kinukob.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/1584920275.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/40579644929.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/gigogelotozug.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000143ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CE 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00015914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15914 11192 bytes
SHA-256: bd13d4a93e8da0945c551e51648a8f0e8bd4778a5217136d75f0f2985ea7d12b
font_03_sfnt_off0001731e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1731E 18528 bytes
SHA-256: c9f26f21e83eeb2baa8c637c0566a4a69251415af2a8f1b8f00dbf1a0d8bc66e

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