Malicious PDF — malware analysis report

Static analysis result for SHA-256 e756eadf0d981327…

MALICIOUS

PDF

69.2 KB Created: 2021-09-04 10:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0e3d8e5634cdaeadd51ceeefd3a96af SHA-1: f6a0a13f300e9345db0eb1acc4412b7cbe2732af SHA-256: e756eadf0d9813272d21f671224763ea1186fa0f307a5721dd712fb540383878
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document utilizes an image-only lure, a common tactic for phishing or malware delivery. It contains numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drafthe.ru/uplcv?utm_term=free+singer+sewing+machine+manual+download PDF link annotation
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/kugavokutevemuweborufum.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/80963227148.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4152c1ca2---zabogadaposogibefemixesud.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/xasefolirobobejotazu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/75251649141.pdfIn PDF document text
    • https://zagi.hr/files/72475145977.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/3qk19rcjdmklan8m68rmkdme12/votebisoliral.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xibojuxajexo.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/fituzimu.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/5901706049.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/luzugebipe.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7066385386be6925b1440eaf8815e7a1/86987967798.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/33e34bcaddb5ba600ed22880a974ea36/xuletupibulewi.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/97690359766.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/kawibojegekotelala.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/46bb12ff754d46f5957940166fe42380/samujor.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/2055760509.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/votifu.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-1/20210601112007730663.pdfIn PDF document text
    • https://iword.de/userfiles/file/88666270860.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/gokinozaforupizavizoxarow.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dac264c6f7b81081f3484f3ea007dedd/mifuxagajuniviji.pdfIn PDF document text
    • http://stevis.cz/files/file/29823735878.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hsnbtsehuhq4ism9j02hduvov3/777638582.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_off0000b32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 10884 bytes
SHA-256: 4000df06b2d4a69a6e29d7c3b162425f03f27437ad4b20a0d64a7b9cb06e7c6d
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 14096 bytes
SHA-256: 84bbe828a3856677f55aaac2801795cf6794a9eee7f93a8c2f49ce123030249d
font_02_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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