Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a1ecb1803b0f8c…

MALICIOUS

PDF

109.9 KB Created: 2021-06-29 16:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e3f097fb3265a856bed4c478a84711a0 SHA-1: fe4d6ec703f9b62ce49fd4119c4dc2d0e4b2afe3 SHA-256: 08a1ecb1803b0f8c3dc06b48212ae0c545b5b867c5f11d31d8e7b1dd2fd1b9a0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://inwebjor.ru/uplcv?utm_term=games+like+crystal+chronicles PDF link annotation
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f26b6058---62596379469.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/wewapobugobovunigekideb.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c950b33897---68037193097.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/veralizedifowikozobi.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/xusukapuz.pdfIn PDF document text
    • https://ptogel2.com/contents//files/68968193258.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qs3eu0uj3s8ul94235rnp02ghk/2331291999.pdfIn PDF document text
    • http://malachowiacy.pl/files/file/75886458312.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/widibunesefovurovun.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42df434606---tudapawasopelazi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/61igkh9urih89brdq9nl3eppt1/52090510971.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mcc5gbooji7v89su9q4ivap6kq/noxolepumolupifosijosiv.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9c020fd778a1ddbd2c8d2f4001cc78ad/zukotevo.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/745009577.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/07rtdt13999jqte0rlsc0onc36/57764103876.pdfIn PDF document text
    • http://mutitar.com/user_img/files/97871787739.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/90018053990.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6200719ff31c8014c504e7a54351ef0a/rozobivar.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/dacac723097ca16410ea2c26fac4ec3e/46024863737.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8a29f3f0---77423913408.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/89aae64be10cc08c8db837f395af3e39/mexajejutuzavajabesebaxo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/mamusamebugukikipepib.pdfIn PDF document text
    • http://mfahk.com/upload/files/zenarovoxol.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/zemolopoxusefegibidufed.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_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 10740 bytes
SHA-256: 00e60dd590a534d52af7ac0dc78b013cb15458edb231af3ca83137951ec6837d
font_01_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 22176 bytes
SHA-256: 662f2e287355203250293ca174474811f32b104a3b846f8957de5406785bd89d
font_02_sfnt_off00016007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16007 19528 bytes
SHA-256: 6e49194c5f4143aed7094a52356ed04da2a5ea9eaadaa8ebdb4f239e4abc3f8d
font_03_sfnt_off000191f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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