Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6161ceefea1745…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 13:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df8f3d072b447b09d6afde9a8805bac7 SHA-1: 83bb1237eb7812eb7d97daae23d197f60d8335ec SHA-256: 1a6161ceefea17459965661fe48328b6fce7175c3184a9f384aef2e6affc2190
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to lure users to external sites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://mnogonomerov.ru/uploads/file/xutinixede.pdf In PDF document text
    • http://ky-auto.com/uploadfile/files/labepotusiledo.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210902142649.pdfIn PDF document text
    • https://advik.net/userfiles/file/zojuxofumogovim.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/40170864284.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/pakapalewexorizokajasele.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/2347695015.pdfIn PDF document text
    • http://kim-clark.ru/files/file/zakonaganikudemunakenar.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354bdc27854---wolugisazito.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/pakosade.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/xazitekiviv.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138082bbbf1f---73953194862.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d28640f6a---fevebabemizuwo.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/83354874148.pdfIn PDF document text
    • http://calisnt.com/uploads/files/sebuwozomafi.pdfIn PDF document text
    • https://grnca.org/img/files/files/50966860685.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/zeleliwukufilepadir.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/53779423991.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161304c4ea2cae---80968512372.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/nerodemobojopa.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/gagarawon.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161371f28827be---zezekowabimobizavajugunos.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/majapuwojitaxirupabusa.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/1572101904.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/8578850059.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/13408965417.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138543ae45fc---41702164787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=shakespeare+hamlet+book+pdfPDF 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_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 18320 bytes
SHA-256: e77ad5f4c61c1d0881b9056804c0ec149a068d145c351e765e8b19494d87994e
font_01_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 10872 bytes
SHA-256: a4c4771dfab38bb843ee82208c6fd182a14865d7316ca1e839925c4449b0dfcc