Malicious PDF — malware analysis report

Static analysis result for SHA-256 872df9f35d7bb891…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 09:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de3212f10f9afc807a0511818d94502e SHA-1: 395bfd22ed4d9d490f3fc6e7ae3f0385e89737c2 SHA-256: 872df9f35d7bb891bec5f13cd81e4b862df227a9c5a88ba6d5050e7188de3a5b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to external PDFs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to trick users into downloading further malicious payloads, likely through social engineering tactics related to prizes or deliveries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://reutlinger.pl/userfiles/file/nariduvalosexazisafi.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a105139d0a1---gaxotipimiko.pdf
    • https://gujaratisamajparis.org/upload/files/medunizipupizorela.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fcf33a8ff---vupasunev.pdf
    • https://hunde-katzen.at/soubory/xojokuvigajopusob.pdf
    • https://baoholaodong24.com/userfiles/file/6548160489.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/7192767339.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/memagewawovifamu.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/fofuwasoze.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/3eddd09eae9e5f61c55eb27efa7605d2/21233093679.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/28cb42d8aa03103cd65025278ab471f7/wuvifosematefuxu.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/rumudijuranotusev.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3779a112a3ecd609cd9ea92ea54bca49/63331172945.pdf
    • https://atlastoursntravels.com/userfiles/file/96086704017.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5e4e936f719d37364beb9a637614bd81/59738748023.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e51833d25bb9946646a4202aaa0fc492/lugubupemamej.pdf
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/96414643662.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/a5mor1kbgtf0ur9d80o637k0k1/54930098705.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5bd47d7c00eaee01936c06100136eb69/pekez.pdf
    • http://hms31.ru/img/file/lovopusur.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1bc36ac860ad7aab34f7a4bedc73a70b/22963301122.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6dc3b743c---28535575256.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47e5d9505---kedukagipogakumosupofa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=max+life+online+term+plan+plus+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8a.bin
b799eff4630824fc54fbb5708f2d303aef0ee73f50e1c5c3876cf41e884c1fbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 10856 bytes
font_01_sfnt_off00010895.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 16792 bytes
font_02_sfnt_off000120a7.bin
91c88c07faa7e330d71fd74f980f138405884480be1b2704ed738d7dceb3ccd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 17288 bytes