Malicious PDF — malware analysis report

Static analysis result for SHA-256 38eff003194a4172…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 13:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5cdc7501406990b553ba65f55c4c288c SHA-1: 9b779fb6321adc27f390828ded3d1422defeec53 SHA-256: 38eff003194a41724f9a6331576b127c9ec2890280a3f3fa24d50dcdd18d38e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure and URL patterns are consistent with SEO poisoning and link farm tactics to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://cructi.ru/uplcv?utm_term=verdienstbescheinigung+wohngeld+k%C3%B6ln+pdf PDF link annotation
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mp238hf4vg2ffcj4e88hi97811/2370831074.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/l364udp7ilaff1nd375goanljc/fabelavawipe.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/54146544045.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/dunolasoli.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/nalixelirusipuzi.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/17880038850.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waxazonuja.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5645760db2---dapijoxusalefoxirozuki.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///29065515993.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d68026fafc---96513466931.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/gajagugokoselo.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/gofovel.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/0a1ce155c4eb865fef4ada693191fcff/sidirobuxiwakawip.pdfIn PDF document text
    • http://rld-carbon.ru/file/jivetogevufofilewekeve.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/24178042480.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/30264341951.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/velup.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab92f4de647---86035296089.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9cff23c5d53da7e753dd1edd7c8a315e/36106387331.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608544c31991d---85527856613.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/gerofoxovobafupimuxoku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 11340 bytes
SHA-256: 23dfbd78c3bbaf7e63a7b889770ad5cfbdd636cdcc62c3c10a0dee367ad2bfbd
font_02_sfnt_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 18656 bytes
SHA-256: fe1871add7f6a1e465046dd33eb4cc7561afb7e6f8f5482cf14709fe54bd19ca

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